| NASSA | National Aboriginal Student Services Association 
| Others |
| NASSA | National Association of Shooting Sports Athletes
| Others |
| NASSA | National Australian Sports Sedan Association
| Others |
| NASSA | Noradrenergic And Specific Serotonergic Antidepressant
| Others |
| NASSA | Noradrenergic and specific serotonergic antidepressants
| Others |
| NASSA | North Acceleration Speed Strength and Agility
| Others |
| NASSA | North American Shetland Sheepbreeders Assoc
| Others |
| NASSA | North American Stone Skipping Association
| Others |